<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>径向渐变</title>
	<style>
		.box1{
			width:200px;
			height:200px;
			border-radius:50%;
			background-image:radial-gradient(red,yellow);
		}
	</style>
</head>
<body>
	<div class="box1">
	</div>
</body>
</html>